Learn about this topic in these articles:

conflict with Minamoto

In 1185 he destroyed
Fujiwara Yasuhira, an independent noble of the Tohoku area, demonstrating his ambition to create a power structure independent of the capital, at Kyōto. In 1192, a few months after his old rival Go-Shirakawa’s death, Yoritomo, now with no one to hinder his ultimate ambition, titled himself
seiitaishōgun (“barbarian-quelling...